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Start at the beginning.
Disassemble the die completely and clean it out with brake cleaner.
Make sure that the little vent hole up near the shoulder is also unobstructed.
Insert the spindle and allow the decapper pin to stick out 3/6"-1/4".
Make sure that the expander is screwed all the way in on the spindle.
Set your die up in the press following the directions supplied with the dies and try again.
Are the primers crimped in or are these primers tha you had previously loaded yourself.
I use a universal decapping die to deprime cases with a military crimp.
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